I'd love to hear what they are doing to monitor their system. They didn't mention that. 3 out of 15 drives failures to loose a volume seems quite likely at that

I'd love to hear what they are doing to monitor their system. They didn't mention that. 3 out of 15 drives failures to loose a volume seems quite likely at that scale. I'd like to know what levels of warnings and alarms they use with which system, e.g. nagios, etc.